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  2. Pragmatic theory of truth - Wikipedia

    en.wikipedia.org/wiki/Pragmatic_theory_of_truth

    Pragmatism describes an indicator or a sign of truth. It really cannot be regarded as a theory of the meaning of the word "true". There's a difference between stating an indicator and giving the meaning. For example, when the streetlights turn on at the end of a day, that's an indicator, a sign, that evening is coming on. It would be an obvious ...

  3. Tractatus Logico-Philosophicus - Wikipedia

    en.wikipedia.org/wiki/Tractatus_Logico-Philosophicus

    Proposition 6.54, then, presents a difficult interpretative problem. If the so-called 'picture theory' of meaning is correct, and it is impossible to represent logical form, then the theory, by trying to say something about how language and the world must be for there to be meaning, is self-undermining.

  4. All men are created equal - Wikipedia

    en.wikipedia.org/wiki/All_men_are_created_equal

    John C. Calhoun agreed, saying that there was "not a word of truth" in the phrase. [24] In 1853 and in the context of the Kansas-Nebraska Act, Senator John Pettit, said that the phrase was not a "self-evident truth" but a "self-evident lie". [24] These men were all either slave owners or supporters of slavery.

  5. Cogito, ergo sum - Wikipedia

    en.wikipedia.org/wiki/Cogito,_ergo_sum

    The Latin cogito, ergo sum, usually translated into English as "I think, therefore I am", [a] is the "first principle" of René Descartes's philosophy. He originally published it in French as je pense, donc je suis in his 1637 Discourse on the Method, so as to reach a wider audience than Latin would have allowed. [1]

  6. Criteria of truth - Wikipedia

    en.wikipedia.org/wiki/Criteria_of_truth

    Their knowledge and familiarity within a given field or area of knowledge command respect and allow their statements to be criteria of truth. A person may not simply declare themselves an authority, but rather must be properly qualified. Despite the wide respect given to expert testimony, it is not an infallible criterion. For example, multiple ...

  7. Problem of induction - Wikipedia

    en.wikipedia.org/wiki/Problem_of_induction

    Causes of effects cannot be linked through a priori reasoning, but by positing a "necessary connection" that depends on the "uniformity of nature". Hume situates his introduction to the problem of induction in A Treatise of Human Nature within his larger discussion on the nature of causes and effects (Book I, Part III, Section VI). He writes ...

  8. Fitch's paradox of knowability - Wikipedia

    en.wikipedia.org/wiki/Fitch's_paradox_of_knowability

    Hence, the statement "p is an unknown truth" cannot be both known and true at the same time. Therefore, if all truths are knowable, the set of "all truths" must not include any of the form "something is an unknown truth"; thus there must be no unknown truths, and thus all truths must be known. This can be formalised with modal logic.

  9. Language, Truth, and Logic - Wikipedia

    en.wikipedia.org/wiki/Language,_Truth,_and_Logic

    Language, Truth and Logic is a 1936 book about meaning by the philosopher Alfred Jules Ayer, in which the author defines, explains, and argues for the verification principle of logical positivism, sometimes referred to as the criterion of significance or criterion of meaning.